Pile-driver hammer



(No Model.)

J. MUNRO. PILB DRIVER HAMMER.

No. 551,989. Y Patented Dec. 24, 1895.

. /Z Fig.1. I F .2, 2i

WITNESSES I I mrI zmrzolz .fw y 7/ZWM/w- M1 7. QQJWM f .flttorn'eyUNITED STATES PATENT @FFICE.

JOSEPH MUNRO, OF ASTORIA, OREGON.

PlLE-DRIVER HAMMER.

' SPECIFICATION forming part of Letters Patent No. 551,989, datedDecember 24, 1895'.

Application filed August a, 1895. $eria1No.558,089. (N0 model.)

To all whom, it may concern.-

Be it known that I, JOSEPH IWIUNRO, a citizen of the United States, anda resident of Astoria, in the county of Olatsop and State of Oregon,have invented certain new and useful Improvementsin Pile-Driver Hammers;and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to letters of reference markedthereon, which form a part of this specification.

Figure 1 of the drawings is a face view of the invention. Fig. 2 is asection on line a; 00, Fig. 1. Fig. 3 is a bottom plan view of thefollower.

The object of this invention is to provide a pile-driver hammer with afollower which is arranged to fit the top of the pile to keep it fromsplitting and in its proper place while it is being driven; and theinvention consists in the novel construction and combination of parts,all as hereinafter described, and pointed out in the appended claims.

Referring to the accompanying drawings, the letter Z designates anupright frame of any suitable character, between vertical guides or ways2 of which is arranged to reciprocate the hammer A. This hammer consistsof a body of iron formed at its lateral portions with vertical groovesa, which engage and move upon the ways or guides z. Formed in the bottomof said hammer is a frusto-conical socket A, which is usually abouttwelve inches in depth, twelve inches in diameter at its upper end andeighteen inches in diameter at its lower end. These dimensions, however,may be varied.

B designates the follower, which consists also of a body of iron ofcylinder form, preferably, and having grooves b in its lateral portionswhich correspond to the grooves a of the hammer. In the upper end ofthis follower is formed a shallow socket 0, usually about one inch indepth, and into which is fitted a frusto-conical block 0 of hard wood.This block 0, ,upon the descent of the hammer, enters the socket Athereof and receives the impact of the blow. Said block has a lowerportion 0 which does not enter the said socket and which serves toprevent direct contact between the two bodies of iron.

In the lower end of the follower C is formed a frusto conical socket D,which is usually of about the same dimensions as the socket A of thehammer, and which is adapted to fit over the end of the pile to preventthe latter from splitting or spreading, and to hold it steady while itis being driven.

E designates a metallic bushing or thimble which is arranged to fit intothe socket D, being of frusto-conical form. The interior diameter ofthis bushing or thimble is usually six inches at its upper end andtwelve inches at the lower end. It is secured firmly in place by meansof bolts c whose heads are countersunk into the bushing or thimble andwhich are secured by nuts e upon the outside of the follower. Thesebolts can be readily removed and the bushing or thimble taken out orreplaced, it being designed for use only when driving small piles, whichare usually about six inches in diameter at the driving end. In drivingsuch piles. with a follower having a large socket, such as is employedfor twelve-inch piles, the pile is moved from one side to the other andcauses the hammer to fracture the leaders. By the use of this thimble orbushing the pile is held firm and directly in the center and is driveneasier and faster, all prying and wedging being avoided.

Means are usually provided whereby the hammer and follower'may beconnected together. In the drawings 1 have shown the follower as havingchains, cords, or the like, (indicated at 1-1,) which are adapted toslip over' pins or projections h of the hammer. The purpose of thisconnection is to permit the hammer and follower to be raised and loweredtogether, or to be held together at the top of the leaders when not inuse.

K K designate small holes or apertures which communicate, one at eachside, with the lower portion of the shallow socket 0. These holes serveto admit a suitable tool or implement underneath theblock O in orderthat said block may be pried out and a new one inserted when necessary.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

frusto-conical socket of a follower having in its upper end anon-metallic frusto-conical I 5 block, and in its lower end afrusto-conical socket, and a bushing or thimble adapted to be removablysecured within the said socket, substantially as specified.

In testimony whereof I affix my signature 20 'in presence of twowitnesses.

JOSEPH MUNRO.

"Vitnesses E. Z. FERGUSON, JULIA MUNRO.

